525 lines · c
1/*2 * Copyright (c) 2010-2011 Atheros Communications Inc.3 *4 * Permission to use, copy, modify, and/or distribute this software for any5 * purpose with or without fee is hereby granted, provided that the above6 * copyright notice and this permission notice appear in all copies.7 *8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.15 */16 17#include "htc.h"18 19#define FUDGE 220 21void ath9k_htc_beaconq_config(struct ath9k_htc_priv *priv)22{23 struct ath_hw *ah = priv->ah;24 struct ath9k_tx_queue_info qi, qi_be;25 26 memset(&qi, 0, sizeof(struct ath9k_tx_queue_info));27 memset(&qi_be, 0, sizeof(struct ath9k_tx_queue_info));28 29 ath9k_hw_get_txq_props(ah, priv->beacon.beaconq, &qi);30 31 if (priv->ah->opmode == NL80211_IFTYPE_AP ||32 priv->ah->opmode == NL80211_IFTYPE_MESH_POINT) {33 qi.tqi_aifs = 1;34 qi.tqi_cwmin = 0;35 qi.tqi_cwmax = 0;36 } else if (priv->ah->opmode == NL80211_IFTYPE_ADHOC) {37 int qnum = priv->hwq_map[IEEE80211_AC_BE];38 39 ath9k_hw_get_txq_props(ah, qnum, &qi_be);40 41 qi.tqi_aifs = qi_be.tqi_aifs;42 43 /*44 * For WIFI Beacon Distribution45 * Long slot time : 2x cwmin46 * Short slot time : 4x cwmin47 */48 if (ah->slottime == 20)49 qi.tqi_cwmin = 2*qi_be.tqi_cwmin;50 else51 qi.tqi_cwmin = 4*qi_be.tqi_cwmin;52 53 qi.tqi_cwmax = qi_be.tqi_cwmax;54 55 }56 57 if (!ath9k_hw_set_txq_props(ah, priv->beacon.beaconq, &qi)) {58 ath_err(ath9k_hw_common(ah),59 "Unable to update beacon queue %u!\n", priv->beacon.beaconq);60 } else {61 ath9k_hw_resettxqueue(ah, priv->beacon.beaconq);62 }63}64 65/*66 * Both nexttbtt and intval have to be in usecs.67 */68static void ath9k_htc_beacon_init(struct ath9k_htc_priv *priv,69 struct ath_beacon_config *conf,70 bool reset_tsf)71{72 struct ath_hw *ah = priv->ah;73 int ret __attribute__ ((unused));74 __be32 htc_imask = 0;75 u8 cmd_rsp;76 77 if (conf->intval >= TU_TO_USEC(DEFAULT_SWBA_RESPONSE))78 ah->config.sw_beacon_response_time = DEFAULT_SWBA_RESPONSE;79 else80 ah->config.sw_beacon_response_time = MIN_SWBA_RESPONSE;81 82 WMI_CMD(WMI_DISABLE_INTR_CMDID);83 if (reset_tsf)84 ath9k_hw_reset_tsf(ah);85 ath9k_htc_beaconq_config(priv);86 ath9k_hw_beaconinit(ah, conf->nexttbtt, conf->intval);87 priv->beacon.bmisscnt = 0;88 htc_imask = cpu_to_be32(ah->imask);89 WMI_CMD_BUF(WMI_ENABLE_INTR_CMDID, &htc_imask);90}91 92static void ath9k_htc_beacon_config_sta(struct ath9k_htc_priv *priv,93 struct ath_beacon_config *bss_conf)94{95 struct ath9k_beacon_state bs;96 enum ath9k_int imask = 0;97 __be32 htc_imask = 0;98 int ret __attribute__ ((unused));99 u8 cmd_rsp;100 101 if (ath9k_cmn_beacon_config_sta(priv->ah, bss_conf, &bs) == -EPERM)102 return;103 104 WMI_CMD(WMI_DISABLE_INTR_CMDID);105 ath9k_hw_set_sta_beacon_timers(priv->ah, &bs);106 imask |= ATH9K_INT_BMISS;107 htc_imask = cpu_to_be32(imask);108 WMI_CMD_BUF(WMI_ENABLE_INTR_CMDID, &htc_imask);109}110 111static void ath9k_htc_beacon_config_ap(struct ath9k_htc_priv *priv,112 struct ath_beacon_config *conf)113{114 struct ath_hw *ah = priv->ah;115 ah->imask = 0;116 117 ath9k_cmn_beacon_config_ap(ah, conf, ATH9K_HTC_MAX_BCN_VIF);118 ath9k_htc_beacon_init(priv, conf, false);119}120 121static void ath9k_htc_beacon_config_adhoc(struct ath9k_htc_priv *priv,122 struct ath_beacon_config *conf)123{124 struct ath_hw *ah = priv->ah;125 ah->imask = 0;126 127 ath9k_cmn_beacon_config_adhoc(ah, conf);128 ath9k_htc_beacon_init(priv, conf, conf->ibss_creator);129}130 131void ath9k_htc_beaconep(void *drv_priv, struct sk_buff *skb,132 enum htc_endpoint_id ep_id, bool txok)133{134 dev_kfree_skb_any(skb);135}136 137static void ath9k_htc_send_buffered(struct ath9k_htc_priv *priv,138 int slot)139{140 struct ath_common *common = ath9k_hw_common(priv->ah);141 struct ieee80211_vif *vif;142 struct sk_buff *skb;143 struct ieee80211_hdr *hdr;144 int padpos, padsize, ret, tx_slot;145 146 spin_lock_bh(&priv->beacon_lock);147 148 vif = priv->beacon.bslot[slot];149 150 skb = ieee80211_get_buffered_bc(priv->hw, vif);151 152 while(skb) {153 hdr = (struct ieee80211_hdr *) skb->data;154 155 padpos = ieee80211_hdrlen(hdr->frame_control);156 padsize = padpos & 3;157 if (padsize && skb->len > padpos) {158 if (skb_headroom(skb) < padsize) {159 dev_kfree_skb_any(skb);160 goto next;161 }162 skb_push(skb, padsize);163 memmove(skb->data, skb->data + padsize, padpos);164 }165 166 tx_slot = ath9k_htc_tx_get_slot(priv);167 if (tx_slot < 0) {168 ath_dbg(common, XMIT, "No free CAB slot\n");169 dev_kfree_skb_any(skb);170 goto next;171 }172 173 ret = ath9k_htc_tx_start(priv, NULL, skb, tx_slot, true);174 if (ret != 0) {175 ath9k_htc_tx_clear_slot(priv, tx_slot);176 dev_kfree_skb_any(skb);177 178 ath_dbg(common, XMIT, "Failed to send CAB frame\n");179 } else {180 spin_lock_bh(&priv->tx.tx_lock);181 priv->tx.queued_cnt++;182 spin_unlock_bh(&priv->tx.tx_lock);183 }184 next:185 skb = ieee80211_get_buffered_bc(priv->hw, vif);186 }187 188 spin_unlock_bh(&priv->beacon_lock);189}190 191static void ath9k_htc_send_beacon(struct ath9k_htc_priv *priv,192 int slot)193{194 struct ath_common *common = ath9k_hw_common(priv->ah);195 struct ieee80211_vif *vif;196 struct ath9k_htc_vif *avp;197 struct tx_beacon_header beacon_hdr;198 struct ath9k_htc_tx_ctl *tx_ctl;199 struct ieee80211_tx_info *info;200 struct ieee80211_mgmt *mgmt;201 struct sk_buff *beacon;202 u8 *tx_fhdr;203 int ret;204 205 memset(&beacon_hdr, 0, sizeof(struct tx_beacon_header));206 207 spin_lock_bh(&priv->beacon_lock);208 209 vif = priv->beacon.bslot[slot];210 avp = (struct ath9k_htc_vif *)vif->drv_priv;211 212 if (unlikely(test_bit(ATH_OP_SCANNING, &common->op_flags))) {213 spin_unlock_bh(&priv->beacon_lock);214 return;215 }216 217 /* Get a new beacon */218 beacon = ieee80211_beacon_get(priv->hw, vif, 0);219 if (!beacon) {220 spin_unlock_bh(&priv->beacon_lock);221 return;222 }223 224 /*225 * Update the TSF adjust value here, the HW will226 * add this value for every beacon.227 */228 mgmt = (struct ieee80211_mgmt *)beacon->data;229 mgmt->u.beacon.timestamp = avp->tsfadjust;230 231 info = IEEE80211_SKB_CB(beacon);232 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {233 struct ieee80211_hdr *hdr =234 (struct ieee80211_hdr *) beacon->data;235 avp->seq_no += 0x10;236 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);237 hdr->seq_ctrl |= cpu_to_le16(avp->seq_no);238 }239 240 tx_ctl = HTC_SKB_CB(beacon);241 memset(tx_ctl, 0, sizeof(*tx_ctl));242 243 tx_ctl->type = ATH9K_HTC_BEACON;244 tx_ctl->epid = priv->beacon_ep;245 246 beacon_hdr.vif_index = avp->index;247 tx_fhdr = skb_push(beacon, sizeof(beacon_hdr));248 memcpy(tx_fhdr, (u8 *) &beacon_hdr, sizeof(beacon_hdr));249 250 ret = htc_send(priv->htc, beacon);251 if (ret != 0) {252 if (ret == -ENOMEM) {253 ath_dbg(common, BSTUCK,254 "Failed to send beacon, no free TX buffer\n");255 }256 dev_kfree_skb_any(beacon);257 }258 259 spin_unlock_bh(&priv->beacon_lock);260 261 ath9k_htc_csa_is_finished(priv);262}263 264static int ath9k_htc_choose_bslot(struct ath9k_htc_priv *priv,265 struct wmi_event_swba *swba)266{267 struct ath_common *common = ath9k_hw_common(priv->ah);268 u64 tsf;269 u32 tsftu;270 u16 intval;271 int slot;272 273 intval = priv->cur_beacon_conf.beacon_interval;274 275 tsf = be64_to_cpu(swba->tsf);276 tsftu = TSF_TO_TU(tsf >> 32, tsf);277 slot = ((tsftu % intval) * ATH9K_HTC_MAX_BCN_VIF) / intval;278 slot = ATH9K_HTC_MAX_BCN_VIF - slot - 1;279 280 ath_dbg(common, BEACON,281 "Choose slot: %d, tsf: %llu, tsftu: %u, intval: %u\n",282 slot, tsf, tsftu, intval);283 284 return slot;285}286 287void ath9k_htc_swba(struct ath9k_htc_priv *priv,288 struct wmi_event_swba *swba)289{290 struct ath_common *common = ath9k_hw_common(priv->ah);291 int slot;292 293 if (swba->beacon_pending != 0) {294 priv->beacon.bmisscnt++;295 if (priv->beacon.bmisscnt > BSTUCK_THRESHOLD) {296 ath_dbg(common, BSTUCK, "Beacon stuck, HW reset\n");297 ieee80211_queue_work(priv->hw,298 &priv->fatal_work);299 }300 return;301 }302 303 if (priv->beacon.bmisscnt) {304 ath_dbg(common, BSTUCK,305 "Resuming beacon xmit after %u misses\n",306 priv->beacon.bmisscnt);307 priv->beacon.bmisscnt = 0;308 }309 310 slot = ath9k_htc_choose_bslot(priv, swba);311 spin_lock_bh(&priv->beacon_lock);312 if (priv->beacon.bslot[slot] == NULL) {313 spin_unlock_bh(&priv->beacon_lock);314 return;315 }316 spin_unlock_bh(&priv->beacon_lock);317 318 ath9k_htc_send_buffered(priv, slot);319 ath9k_htc_send_beacon(priv, slot);320}321 322void ath9k_htc_assign_bslot(struct ath9k_htc_priv *priv,323 struct ieee80211_vif *vif)324{325 struct ath_common *common = ath9k_hw_common(priv->ah);326 struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *)vif->drv_priv;327 int i = 0;328 329 spin_lock_bh(&priv->beacon_lock);330 for (i = 0; i < ATH9K_HTC_MAX_BCN_VIF; i++) {331 if (priv->beacon.bslot[i] == NULL) {332 avp->bslot = i;333 break;334 }335 }336 337 priv->beacon.bslot[avp->bslot] = vif;338 spin_unlock_bh(&priv->beacon_lock);339 340 ath_dbg(common, CONFIG, "Added interface at beacon slot: %d\n",341 avp->bslot);342}343 344void ath9k_htc_remove_bslot(struct ath9k_htc_priv *priv,345 struct ieee80211_vif *vif)346{347 struct ath_common *common = ath9k_hw_common(priv->ah);348 struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *)vif->drv_priv;349 350 spin_lock_bh(&priv->beacon_lock);351 priv->beacon.bslot[avp->bslot] = NULL;352 spin_unlock_bh(&priv->beacon_lock);353 354 ath_dbg(common, CONFIG, "Removed interface at beacon slot: %d\n",355 avp->bslot);356}357 358/*359 * Calculate the TSF adjustment value for all slots360 * other than zero.361 */362void ath9k_htc_set_tsfadjust(struct ath9k_htc_priv *priv,363 struct ieee80211_vif *vif)364{365 struct ath_common *common = ath9k_hw_common(priv->ah);366 struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *)vif->drv_priv;367 struct ath_beacon_config *cur_conf = &priv->cur_beacon_conf;368 u64 tsfadjust;369 370 if (avp->bslot == 0)371 return;372 373 /*374 * The beacon interval cannot be different for multi-AP mode,375 * and we reach here only for VIF slots greater than zero,376 * so beacon_interval is guaranteed to be set in cur_conf.377 */378 tsfadjust = cur_conf->beacon_interval * avp->bslot / ATH9K_HTC_MAX_BCN_VIF;379 avp->tsfadjust = cpu_to_le64(TU_TO_USEC(tsfadjust));380 381 ath_dbg(common, CONFIG, "tsfadjust is: %llu for bslot: %d\n",382 (unsigned long long)tsfadjust, avp->bslot);383}384 385static void ath9k_htc_beacon_iter(void *data, u8 *mac, struct ieee80211_vif *vif)386{387 bool *beacon_configured = data;388 struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *) vif->drv_priv;389 390 if (vif->type == NL80211_IFTYPE_STATION &&391 avp->beacon_configured)392 *beacon_configured = true;393}394 395static bool ath9k_htc_check_beacon_config(struct ath9k_htc_priv *priv,396 struct ieee80211_vif *vif)397{398 struct ath_common *common = ath9k_hw_common(priv->ah);399 struct ath_beacon_config *cur_conf = &priv->cur_beacon_conf;400 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;401 bool beacon_configured;402 403 /*404 * Changing the beacon interval when multiple AP interfaces405 * are configured will affect beacon transmission of all406 * of them.407 */408 if ((priv->ah->opmode == NL80211_IFTYPE_AP) &&409 (priv->num_ap_vif > 1) &&410 (vif->type == NL80211_IFTYPE_AP) &&411 (cur_conf->beacon_interval != bss_conf->beacon_int)) {412 ath_dbg(common, CONFIG,413 "Changing beacon interval of multiple AP interfaces !\n");414 return false;415 }416 417 /*418 * If the HW is operating in AP mode, any new station interfaces that419 * are added cannot change the beacon parameters.420 */421 if (priv->num_ap_vif &&422 (vif->type != NL80211_IFTYPE_AP)) {423 ath_dbg(common, CONFIG,424 "HW in AP mode, cannot set STA beacon parameters\n");425 return false;426 }427 428 /*429 * The beacon parameters are configured only for the first430 * station interface.431 */432 if ((priv->ah->opmode == NL80211_IFTYPE_STATION) &&433 (priv->num_sta_vif > 1) &&434 (vif->type == NL80211_IFTYPE_STATION)) {435 beacon_configured = false;436 ieee80211_iterate_active_interfaces_atomic(437 priv->hw, IEEE80211_IFACE_ITER_RESUME_ALL,438 ath9k_htc_beacon_iter, &beacon_configured);439 440 if (beacon_configured) {441 ath_dbg(common, CONFIG,442 "Beacon already configured for a station interface\n");443 return false;444 }445 }446 447 return true;448}449 450void ath9k_htc_beacon_config(struct ath9k_htc_priv *priv,451 struct ieee80211_vif *vif)452{453 struct ath_common *common = ath9k_hw_common(priv->ah);454 struct ath_beacon_config *cur_conf = &priv->cur_beacon_conf;455 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;456 struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *) vif->drv_priv;457 458 if (!ath9k_htc_check_beacon_config(priv, vif))459 return;460 461 cur_conf->beacon_interval = bss_conf->beacon_int;462 if (cur_conf->beacon_interval == 0)463 cur_conf->beacon_interval = 100;464 465 cur_conf->dtim_period = bss_conf->dtim_period;466 cur_conf->bmiss_timeout =467 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;468 469 switch (vif->type) {470 case NL80211_IFTYPE_STATION:471 ath9k_htc_beacon_config_sta(priv, cur_conf);472 avp->beacon_configured = true;473 break;474 case NL80211_IFTYPE_ADHOC:475 ath9k_htc_beacon_config_adhoc(priv, cur_conf);476 break;477 case NL80211_IFTYPE_MESH_POINT:478 case NL80211_IFTYPE_AP:479 ath9k_htc_beacon_config_ap(priv, cur_conf);480 break;481 default:482 ath_dbg(common, CONFIG, "Unsupported beaconing mode\n");483 return;484 }485}486 487void ath9k_htc_beacon_reconfig(struct ath9k_htc_priv *priv)488{489 struct ath_common *common = ath9k_hw_common(priv->ah);490 struct ath_beacon_config *cur_conf = &priv->cur_beacon_conf;491 492 switch (priv->ah->opmode) {493 case NL80211_IFTYPE_STATION:494 ath9k_htc_beacon_config_sta(priv, cur_conf);495 break;496 case NL80211_IFTYPE_ADHOC:497 ath9k_htc_beacon_config_adhoc(priv, cur_conf);498 break;499 case NL80211_IFTYPE_MESH_POINT:500 case NL80211_IFTYPE_AP:501 ath9k_htc_beacon_config_ap(priv, cur_conf);502 break;503 default:504 ath_dbg(common, CONFIG, "Unsupported beaconing mode\n");505 return;506 }507}508 509bool ath9k_htc_csa_is_finished(struct ath9k_htc_priv *priv)510{511 struct ieee80211_vif *vif;512 513 vif = priv->csa_vif;514 if (!vif || !vif->bss_conf.csa_active)515 return false;516 517 if (!ieee80211_beacon_cntdwn_is_complete(vif, 0))518 return false;519 520 ieee80211_csa_finish(vif, 0);521 522 priv->csa_vif = NULL;523 return true;524}525